Geometry 1st Semester Review - Vocabulary 1) A ___________ is an example that shows that a statement is false. 2) A __________ statement is an “if-then” statement. 3) Two points are __________ if they lie on the same line. 4) __________ lines are coplanar lines that do not intersect. 5) __________ lines are non-coplanar lines. 6) A __________ is a segment that goes from a vertex of a triangle perpendicular to the opposite side. 7) A __________ is a segment that goes from a vertex of a triangle to the midpoint of the opposite side. 8) A __________ triangle is a triangle having no congruent sides. 9) A __________ polygon is a polygon that is equilateral and equiangular. 10) Three or more lines intersecting at the same point are called __________ lines. 11) __________ angles are non-adjacent angles formed by 2 intersecting lines. 12) __________ is the set of all points. 13) Two lines that intersect to form a right angle are called ___________ lines. 14) An __________ triangle is a triangle having 3 congruent sides. 15) __________ points are points that lie in the same plane. 16) A __________ is formed by switching the hypothesis and conclusion of an if-then statement. 17) A __________ is formed by negating or adding a “not” to a statement. 18) A __________ is a statement that has been proven to be true. 19) A __________ is a line that is coplanar with 2 other lines and it intersects them at 2 different points. 20) If 2 angles have the same degree measure, then they are ___________. 21) A line that goes through the midpoint of a segment is called a ____________ of the segment. 22) The distance around a polygon is called its ___________. 23) Two angles that are adjacent and whose non-common sides form a straight line are called a ___________ ______. 24) An __________ triangle is a triangle having 3 congruent angles. 25) A polygon is ___________ if it has an indention or is “caved in”. 26) Two angles whose degree measures add up to 180 degrees are called __________ angles. 27) The 3 undefined terms in Geometry are _________, _________, and _________. 28) The included angle between the congruent sides of an isosceles triangle is called the __________ angle. 29) A __________ is when you turn a figure around a given point. 30) The “if” part of an if-then statement is called the ___________. 31) The “then” part of an if-then statement is called the ___________. 32) An __________ is formed when you negate both parts of an if-then statement. 33) A __________ is formed by joining 2 statements with the word “and”. 34) A __________ is a what we normally call a conclusion in Geometry. 35) A __________ is formed by joining 2 statements with the word “or”. 36) “Rise over run” is one form of a __________ formula. 37) An equation written in the form y = mx + b is said to be written in ______________ form. 38) A __________ is a statement that is formed by doing both a converse and an inverse. 39) A ___________ is a statement that we accept as true but has never been proven to be true. 40) ___________ angles are 2 angles that are coplanar, have a common side, and no common interior points. 41) A ___________ is formed by flipping a figure over a line. 42) A ___________ is formed by sliding a figure some direction. 43) ___________ reasoning is when you reach a conclusion or conjecture by looking at several examples and determining a pattern. 44) ___________ reasoning is when you reach a conclusion or conjecture based on a fact we know is true. 45) The distance around a circle is known as its __________. 46) Two angles whose degree measures add up to 90 are called __________ angles. 47) A polygon that is not dented or caved in is called a __________ polygon. 48) A __________ is a closed figure formed entirely by segments. 49) A ray that divides an angle into 2 congruent angles is called the ___________ of the angle. 50) An __________ angle of a polygon is outside of the polygon and it forms a linear pair with an interior angle of the polygon. 51) The 2 interior angles of a triangle that do not form a linear pair with an exterior angle are called the ___________ __________ angles. 52) A triangle having at least 2 congruent sides is called an __________ triangle. 53) The point of concurrency of 3 medians in a triangle is called the __________. 54) The point of concurrency of 3 altitudes in a triangle is called the __________. 55) The point of concurrency of 3 angle bisectors in a triangle is called the _________. 56) The point of concurrency of 3 perpendicular bisectors in a triangle is called the __________. 57) A ___________ of a triangle is a segment that joins the midpoints of 2 sides of the triangle. 58) A ___________ _______ of 2 numbers is found by multiplying them together and then doing the square root. 59) A ___________ is formed by setting 2 ratios equal to each other. 60) ___________ figures are 2 figures that are the same size and same shape. 61) ___________ figures are 2 figures that are the same shape but not necessarily the same size. 62) The ratio of the sides of 2 similar figures is called the ________ ___________.